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Why do we need OpenMath?

How do you denote the dihedral group of order n?

This is not a question of “vim or emacs” or “tabs or spaces” sort, but still there are two notations in use. Some sources use Dn to denote a dihedral group of order n, and some others – a dihedral group of order 2n. Both notations are also reflected in mathematical software.

For example, in GAPĀ DihedralGroup(n) returns a group of order n:


and in SageMath – a group of order 2n:


Let us look at other systems: (more…)